| Description: | Radio emission has been detected from tens of white dwarf systems. Most of those are cataclysmic variables, where the white dwarf accretes mass from a cool main sequence companion. Notable exceptions are the binary white dwarf pulsars and magnetic propellers, where material is transferred but does not reach the white dwarf, and the radio most likely arises from synchrotron emission. Additionally, radio emission has been predicted as a possible outcome of a planetary system around a white dwarf. With these possibilities in mind, in this talk I will describe efforts to identify radio-emitting white dwarf systems. The first search was carried out aiming specifically at white dwarf pulsars and used the Gaia HR diagram as a starting point. As a result, one new white dwarf pulsar, J191213.72-441045.1 was identified. Radio follow-up is ongoing and has revealed narrow radio pulses whose intensity varies by orders of magnitude. In the second search, we cross matched the Gaia catalogue of candidate white dwarfs with the Very Large Array Sky Survey (VLASS) Epoch 1 Quick Look Catalogue and identified 13 matches. Out of those, only one has so far stood up to scrutiny, with the others being mainly chance alignments. The nature of the remaining source, WDJ204259.71+152108.06, is still a puzzle. |
